Question 27 (5 points) The auditor is concerned that a client is failing to bill customers for shipments. An audit procedure that would gather relevant evidence would be to: select a sample of duplicate sales invoices and trace each to related shipping documents. trace a sample of shipping documents to related duplicate sales invoices. trace a sample of Sales Journal entries to the Accounts Receivable subsidiary ledger. compare the total of the Schedule of Accounts Receivable with the balance of the Accounts Receivable account in the general ledger